Download Gel Molecular Weight Analyzer app from the page and install the app.
This app fits a standard curve to relate the known molecular weights of proteins in a set of standards (y-axis) to their relative migration (x-axis), and estimates molecular weights of unknow proteins.
Define a lane of standard sample image
Detect bands and mark their positions or mark them manually
Fit a standard curve from the standard sample
Calculate molecular weight of unknown sample by the regression equation